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authorTrond Myklebust <Trond.Myklebust@netapp.com>2009-08-09 15:14:29 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2009-08-09 15:14:29 -0400
commitbc74b4f5e63a09fb78e245794a0de1e5a2716bbe (patch)
tree5e96e63fd69303162456549f12bff5f9b2ee2a22 /net/sunrpc/cache.c
parentda77005f0d64486cd760f43d9b7cc2379262a363 (diff)
downloadop-kernel-dev-bc74b4f5e63a09fb78e245794a0de1e5a2716bbe.zip
op-kernel-dev-bc74b4f5e63a09fb78e245794a0de1e5a2716bbe.tar.gz
SUNRPC: Allow the cache_detail to specify alternative upcall mechanisms
For events that are rare, such as referral DNS lookups, it makes limited sense to have a daemon constantly listening for upcalls on a channel. An alternative in those cases might simply be to run the app that fills the cache using call_usermodehelper_exec() and friends. The following patch allows the cache_detail to specify alternative upcall mechanisms for these particular cases. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/cache.c')
-rw-r--r--net/sunrpc/cache.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index c8e7d2d..e438352 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -176,7 +176,13 @@ struct cache_head *sunrpc_cache_update(struct cache_detail *detail,
}
EXPORT_SYMBOL_GPL(sunrpc_cache_update);
-static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h);
+static int cache_make_upcall(struct cache_detail *cd, struct cache_head *h)
+{
+ if (!cd->cache_upcall)
+ return -EINVAL;
+ return cd->cache_upcall(cd, h);
+}
+
/*
* This is the generic cache management routine for all
* the authentication caches.
@@ -322,7 +328,7 @@ static int create_cache_proc_entries(struct cache_detail *cd)
if (p == NULL)
goto out_nomem;
- if (cd->cache_request || cd->cache_parse) {
+ if (cd->cache_upcall || cd->cache_parse) {
p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR,
cd->proc_ent, &cache_file_operations, cd);
cd->channel_ent = p;
@@ -1080,10 +1086,16 @@ static void warn_no_listener(struct cache_detail *detail)
}
/*
- * register an upcall request to user-space.
+ * register an upcall request to user-space and queue it up for read() by the
+ * upcall daemon.
+ *
* Each request is at most one page long.
*/
-static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
+int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h,
+ void (*cache_request)(struct cache_detail *,
+ struct cache_head *,
+ char **,
+ int *))
{
char *buf;
@@ -1091,9 +1103,6 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
char *bp;
int len;
- if (detail->cache_request == NULL)
- return -EINVAL;
-
if (atomic_read(&detail->readers) == 0 &&
detail->last_close < get_seconds() - 30) {
warn_no_listener(detail);
@@ -1112,7 +1121,7 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
bp = buf; len = PAGE_SIZE;
- detail->cache_request(detail, h, &bp, &len);
+ cache_request(detail, h, &bp, &len);
if (len < 0) {
kfree(buf);
@@ -1130,6 +1139,7 @@ static int cache_make_upcall(struct cache_detail *detail, struct cache_head *h)
wake_up(&queue_wait);
return 0;
}
+EXPORT_SYMBOL_GPL(sunrpc_cache_pipe_upcall);
/*
* parse a message from user-space and pass it
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